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Restoring Previous (antique) Redologs

Hi Forum,

I recently upgraded from ZCS 4.0.5 to ZCS 4.5.10.
/opt/zimbra/db and /opt/zimbra/backup were symlinks to directories in another partition...

During the upgrade process symlinks were removed and replaced by newly created directories... but when I found this out (a few days after), it was too late, clients had already received a lot of new messages...

A user (a head) wants to recover some old but important messages.
It seems that they should still be in the old redologs in the other partition but Zimbra don't want to read these backups because they are in 4.0.5 format...

Is there a way to either restore these backups into a mailbox (either new or existant - no matter) or a way to 'replay' the redologs to make mails sent again to the current mailboxes ?